ASME B89.1.7-MEASURING TAPE PROJECT TEAM DRAFT 3/17/2009

PERFORMANCE STANDARD FOR STEEL MEASURING TAPES

2009

ASME B89.1.7 Steel Measuring Tapes Draft

ConstantinoFDraft Stamp

ASME B89.1.7-MEASURING TAPE PROJECT TEAM DRAFT 3/17/2009

FOREWORD ASME Standards Committee B89 on Dimensional Metrology, under procedures approved by the American National Standards Institute (ANSI), prepares standards that encompass the inspection and the means of measuring characteristics of such various geometric parameters as diameter, length, flatness, parallelism, concentricity, and squareness. Because steel measuring tapes are widely used for the measurement and comparison of some of these features, the Chair of the B89 Division 1 Length authorized the formation of Project Team B89.1.7 to prepare this Standard The overall scope of the Dimensional Metrology Measuring Tape Project Team (B89.1.7) is: "To define the requirements for steel measuring tapes for all units of measures in U.S. Customary units and SI1 units with respect to graduations, numbering, designations, and accuracy." This standard provides guidance to users and manufacturers of steel measuring tapes with respect to quality standards and preferred measuring units by specifying only the requirements that are essential for satisfactory performance. Presently, both the metric and the U.S. Customary System (inch-based) graduations are in popular use. Non-mandatory Appendices A and B discuss Tape Calibration Uncertainties and provide general guidance and awareness regarding the determination and application of calibration uncertainties relative to tape calibrations. Appendix A treats the subject of calibration of a tape by comparison to a master tape; Appendix B discusses calibration of a tape using a laser interferometer. Drafts of this standard were proposed and discussed during project team meetings from January 1996 through October 2008. The American National Standards Institute approved this standard on ____________. Suggestions for improvement of this standard would be welcome. They should be sent to the American Society of Mechanical Engineers (ASME), United Engineering Center, 345 East 47th Street, New York, NY 10017-2392.

1Le Systeme International d'Unites (International System of Units), abbreviated SI in all languages, commonly called the metric system.

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COMMITTEE ROSTER ASME STANDARDS - B89 - DIMENSIONAL METROLOGY

(The following is the roster of the Committee at the time of approval of this Standard)

OFFICERS

Brian Parry Chair Dean Beutel Vice Chair Frederico Constantino Secretary

COMMITTEE PERSONNEL

James B. Bryan Bryan and Associates Tom Carpenter AFMETCAL Thomas Charlton, Jr. Charlton Associates Gregory A Hetland Intl Inst of GD&T Robert J. Hocken UNCC Richard B. Hook METCON Mel Liebers Professional Instruments Co. Steven D.Phillips Natl Inst of Stand & Tech James G. Salisbury Mitutoyo America Corp. Dennis a Swyt Natl Inst of Stand & Tech Benjamin R. Taylor Renishaw PLC Ralph C. Veale Consultant

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ASME B89.1.7-MEASURING TAPE PROJECT TEAM DRAFT 3/17/2009

ASME STANDARDS COMMITTEE B89 PROJECT TEAM 1.7 - MEASURING TAPES

Charles J. Fronczek Chair, Natl Inst of Stand & Tech Chris Blackburn Natl Inst of Stand & Tech Dexter J. Carlson The L.S. Starrett Co Joseph P. DeCarolis Formerly with Stanley Works Michael L. Fink Boeing Commercial Airplane W. Tyler Estler Natl Inst of Stand & Tech Colleen M. Hayden The L.S. Starrett Co Charles C. Lawhon Formerly with Cooper Tools, Lufkin Division Michael J. Moran GSA Richard C. Newton Formerly with The L.S. Starrett Co Daniel Sawyer Natl Inst of Stand & Tech John Schneller U.S.Tape Ralph Veale Consultant Grant L. Wood Stanley Works

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CONTENTS

FOREWORD....................................................................................................................................... II

COMMITTEE ROSTER ..................................................................................................................III

ASME STANDARDS - B89 - DIMENSIONAL METROLOGY ..................................................III

PERFORMANCE STANDARD FOR STEEL MEASURING TAPES...........................................1

1 SCOPE.............................................................................................................................................1

2 DEFINITIONS ...............................................................................................................................1

3 NORMATIVE REFERENCES.....................................................................................................2 3.1 ADDITIONAL REFERENCES..........................................................................................................2

4 GENERAL REQUIREMENTS ....................................................................................................2 4.1 STRAIGHT AND PARALLEL ..........................................................................................................3 4.2 EASE OF READING ......................................................................................................................3 4.3 BACKGROUND ............................................................................................................................3 4.4 COMPATIBILITY ..........................................................................................................................3 4.5 MEASUREMENT UNITS................................................................................................................3 4.6 GRADUATION REQUIREMENTS....................................................................................................3 4.7 ADDITIONAL MARKINGS ............................................................................................................4 4.8 NUMBERING ...............................................................................................................................4 4.9 DEFINITION OF THE CALIBRATED DISTANCE ..............................................................................4

5 STEEL MEASURING TAPES .....................................................................................................6 5.1 RETRACTABLE STEEL TAPE RULE ..............................................................................................6 5.2 MEASURING TAPE STEEL GENERAL PURPOSE .........................................................................6 5.3 MEASURING TAPE SURVEYING / ENGINEERING .......................................................................6 5.4 MEASURING TAPE LIQUID GAUGING .......................................................................................6

6 CALIBRATION AND MAXIMUM PERMISSIBLE ERRORS ...............................................7 6.1 TENSION .....................................................................................................................................7 6.2 CALIBRATION PROCEDURE .........................................................................................................7 6.3 MAXIMUM PERMISSIBLE ERRORS (MPE) REQUIREMENTS..........................................................8

APPENDIX I - MANDATORY REFERENCE STANDARD TRACEABILITY.........................11 I.1 GENERAL TRACEABILITY ISSUES IN ASME B89.1.7 .................................................................11 I.2 REFERENCE STANDARD TRACEABILITY.....................................................................................11 I.3 METROLOGICAL TERMINUS.......................................................................................................12

APPENDIX A - NON-MANDATORY CALIBRATION OF A TAPE BY COMPARISON TO A MASTER TAPE..................................................................................................................................13

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A.1 TEST SETUP...............................................................................................................................13 A.2 NOTATION ................................................................................................................................14 A.3 CALIBRATION PROCEDURE........................................................................................................14 A.4 UNCERTAINTY EVALUATION.....................................................................................................15 A.5 DECISION RULE.........................................................................................................................16 A.6 EXAMPLE: COMPARATOR REQUIREMENT FOR TAPE CALIBRATION ............................................16

APPENDIX B - NON-MANDATORY CALIBRATION OF A TAPE USING A LASER INTERFEROMETER ........................................................................................................................18

B.1 THE TEST SETUP........................................................................................................................18 B.2 NOTATION ................................................................................................................................19 B.3 LASER INTERFEROMETER TAPE CALIBRATION SETUP .......................................................